annotation_list_builder hangs if you pass a string instead of an integer

[drolando]

from py_zipkin.thrift import annotation_list_builder

annotation_list_builder(
    {
        'sr': '1480534584',
        'ss': '1480534590',
    },
    host=endpoint
)

annotation_list_builder expects the timestamp to be an float (or int) number representing the timestamp in seconds, with and optional microsecond precision after the ..
If the timestamp is a string, it'll instead just hang forever and you'll be forced to use kill -9 to stop your script.

We should add some type validation to return an error if the timestamps are not numbers.

[mjbryant]

Interesting addition: it hangs because create_annotation is doing timestamp * 1000000. If it gets a string, it'll try to create a > 1M character string, and apparently that takes a while.